If a star is extremely massive (more than 100-solar masses), why isn't it likely to survive for long?
A) It may blow itself apart because of radiation pressure.
B) It explodes as a supernova after just a few dozen years.
C) It eventually divides into two lower-mass stars.
D) Its great mass will cause it to collapse immediately to make a black hole.
A) It may blow itself apart because of radiation pressure.
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The ____________________ of a telescope is determined by the size of the objective
Fill in the blank(s) with correct word
Where do stars form and why?
A) Stars form around giant planets because planets provide the "seeds" of star formation. B) Stars form in cold gas clouds because gravity has to be stronger than gas pressure. C) Stars form in warm dust clouds because the dust shields the protostars from radiation. D) Stars form in hot gas clouds because stars have to be hot to start fusion reactions.
A circular cylinder of height 1.20 m having faces of diameter 0.620 m is immersed in water of density 1.00 × 10^3 kg/m3 with its axis vertical so that its faces are parallel to the surface of the water. The upper face is 2.50 m below the surface of the water. The net force on this cylinder is observed to be 1120 N downward. Atmospheric pressure is 1.01 × 10^5 Pa. What is the weight of the cylinder?
A) 7.40 × 10^3 N B) 1.09 × 10^4 N C) 3.79 × 10^4 N D) 4.14 × 10^4 N E) 1.37 × 10^5 N
Assume that a closed system undergoes a reversible process that takes it from state A to a different state B. In which of these cases will the entropy of the system remain constant? ea breeze is
1.if the process is isothermal 2.if the process is adiabatic 3.if the process is isovolumetric 4.The system's entropy will remain constant for all of these cases.